[Pkg-javascript-commits] [node-sha.js] 58/237: expose createHash, like node's crypto

[Bastien Roucariès]

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rouca pushed a commit to branch master
in repository node-sha.js.

commit 41a1c531c7947f1bc16ff33ba8dc9335a1a932fd
Author: Dominic Tarr <dominic.tarr at gmail.com>
Date:   Fri Dec 27 21:25:17 2013 +0700

    expose createHash, like node's crypto
---
 index.js            | 147 +++-------------------------------------------------
 index.js => sha1.js |   0
 2 files changed, 7 insertions(+), 140 deletions(-)

diff --git a/index.js b/index.js
index a2f4c61..d9d242c 100644
--- a/index.js
+++ b/index.js
@@ -1,142 +1,9 @@
-/*
- * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
- * in FIPS PUB 180-1
- * Version 2.1a Copyright Paul Johnston 2000 - 2002.
- * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
- * Distributed under the BSD License
- * See http://pajhome.org.uk/crypt/md5 for details.
- */
-var hexpp = require('./hexpp').defaults({bigendian: false})
-
-var u = require('./util')
-var reverseByteOrder = u.reverseByteOrder
-var zeroFill = u.zeroFill
-module.exports = Sha1
-
-var inherits = require('util').inherits
-var Hash = require('./hash')
-
-inherits(Sha1, Hash)
-
-var q = false
-var A = 0
-var B = 4
-var C = 8
-var D = 12
-var E = 16
-
-var BE = false
-var LE = true
-
-function Sha1 () {
-  if(!(this instanceof Sha1)) return new Sha1()
-
-  this._w = new Uint32Array(80)
-  Hash.call(this, 16*4, 14*4)
-  
-  this._h = new Uint8Array(20)
-  var H = this._dvH = new DataView(this._h.buffer)
-
-  H.setUint32(A, 0x01234567, LE)
-  H.setUint32(B, 0x89abcdef, LE)
-  H.setUint32(C, 0xfedcba98, LE)
-  H.setUint32(D, 0x76543210, LE)
-  H.setUint32(E, 0xf0e1d2c3, LE)
-
-  this._len = 0
-}
-
-
-// assume that array is a Uint32Array with length=16,
-// and that if it is the last block, it already has the length and the 1 bit appended.
-
-Sha1.prototype._update = function (array) {
-
-  var X = this._dv
-  var H = this._dvH
-  
-  var h = this._h
-
-  var a = _a = H.getUint32(A, BE)
-  var b = _b = H.getUint32(B, BE)
-  var c = _c = H.getUint32(C, BE)
-  var d = _d = H.getUint32(D, BE)
-  var e = _e = H.getUint32(E, BE)
-
-  var w = this._w
-  var x = this._block
-
-//  console.log('--- Update ---')
-//  console.log(hexpp(x))
-
-  for(var j = 0; j < 80; j++) {
-
-    w[j] = j < 16
-      ? X.getUint32(j*4, BE)
-      : rol(w[j - 3] ^ w[j -  8] ^ w[j - 14] ^ w[j - 16], 1)
-
-    var t =
-      safe_add(
-        safe_add(
-          rol(a, 5),
-          sha1_ft(j, b, c, d)
-        ),
-        safe_add(
-          safe_add(e, w[j]),
-          sha1_kt(j)
-        )
-      );
-
-    e = d
-    d = c
-    c = rol(b, 30)
-    b = a
-    a = t
-  }
-
-  H.setUint32(A, safe_add(a, _a), BE)
-  H.setUint32(B, safe_add(b, _b), BE)
-  H.setUint32(C, safe_add(c, _c), BE)
-  H.setUint32(D, safe_add(d, _d), BE)
-  H.setUint32(E, safe_add(e, _e), BE)
-
-  return h
-}
-
-/*
- * Perform the appropriate triplet combination function for the current
- * iteration
- */
-function sha1_ft(t, b, c, d) {
-  if(t < 20) return (b & c) | ((~b) & d);
-  if(t < 40) return b ^ c ^ d;
-  if(t < 60) return (b & c) | (b & d) | (c & d);
-  return b ^ c ^ d;
-}
-
-/*
- * Determine the appropriate additive constant for the current iteration
- */
-function sha1_kt(t) {
-  return (t < 20) ?  1518500249 : (t < 40) ?  1859775393 :
-         (t < 60) ? -1894007588 : -899497514;
-}
-
-/*
- * Add integers, wrapping at 2^32. This uses 16-bit operations internally
- * to work around bugs in some JS interpreters.
- * //dominictarr: this is 10 years old, so maybe this can be dropped?)
- */
-function safe_add(x, y) {
-  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
-  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
-  return (msw << 16) | (lsw & 0xFFFF);
-}
-
-/*
- * Bitwise rotate a 32-bit number to the left.
- */
-function rol(num, cnt) {
-  return (num << cnt) | (num >>> (32 - cnt));
+var exports = module.exports = function (alg) {
+  var Alg = exports[alg]
+  if(!Alg) throw new Error(alg + ' is not supported (we accept pull requests)')
+  return new Alg()
 }
 
+exports.sha =
+exports.sha1 = require('./sha1')
+exports.sha256 = require('./sha256')
diff --git a/index.js b/sha1.js
similarity index 100%
copy from index.js
copy to sha1.js

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